tethering 3g NDIS USB (cell phone) on ASUS RT-N16

Does anybody know how difficult it would be to support 3g NDIS USB devices on this router/tomato? If it has already been done, I couldn't find how anywhere. I have the teddy bear tomato mod on the router already which provides the ability to "NAS" a USB storage device just like the factory firmware and DD-WRT. (3g would be the WAN segment)

Does anybody know how difficult it would be to support 3g NDIS USB devices on this router/tomato? If it has already been done, I couldn't find how anywhere. I have the teddy bear tomato mod on the router already which provides the ability to "NAS" a USB storage device just like the factory firmware and DD-WRT. (3g would be the WAN segment)

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Let me rephrase what you're trying to do, and maybe someone can help...
You want to plug in a Cellular/3G USB Dongle into the USB port on your router, and have the router use that connection to access the internet, through your cellular provider. Yes?

I don't know anything about USB drivers for a device like that. Obviously the router would have to know how to talk to that device, and also know to route traffic to it instead of the WAN.